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B. B. KAHN.

ELECTRIC HEAIER.

APPLICATION FILED JULY 25. 1am.

1,304,687. Patented May 27, 1919.

Bert/4MB lfq/m Wroness: F a Inventor b 9 LUSELL Attornom UNITED PATEN T OFFICE.

BERTRAND IB. KAI-IN, OF CINCINNATI, OHIO, ASSIGNOR TO THE ESTATE STOVE COMPANY, OF HAMILTON, OHIO.

ELECTRIC HEATER.

Application filed July 25, 1918.

T 0 all whom it may concern Be it known that I, BERTRANI) B. HAHN, a citizen of the United States, residing at Cincinnati, Hamilton county, ()hio, have invented certain new and useful Improvements in Electric Heaters, of which the following is a specification.

This invention, pertaining to electric heaters of the radiator reflector class, relates to the form and construction of the radiator and will be readily understood from the following description taken in connection with the accompanying drawing in which:

Figure l is a side elevation. part vertical section, of a reflecting radiator embodying my invention, the section appearing in the plane of line a of Figs. 2 and 3:

Fig. 2 a front elevation of the same:

Fig. 3 a rear elevation of the same: and

Fig. 4 a horizontal section of the radiator in the plane of line b of Figs. 1, 2 and 3,

A diversity of scale is employed in the drawing.

In the drawing 1, indicates a concave reflector:

2, a stud having its rear end anchored into the center of the back of the reflector:

3, a hollow frusto-conical insulator secured to the forward end of the stud, the open rear portion of the insulator being spaced forward from the reflector, this insulator being formed of refractory insulating material: I

4, a groove extending helically around the exterior of the insulator:

5, a. coil of resistance wire laid in this groove and having its terminal ends projecting through the wall of the insulator and rearward to suitable binding-posts adapted to have connected with them the conductors for bringing current to the heater: and

6, ports leading to the interior of the insulator from the base of the helical groove therein.

Upon a passage of current through the resistance wire it becomes heated and luminous and rays of heat become projected forwardly directly therefrom. At the same time rays from the wire strike the concave surface of the reflector and are reflected forwardly therefrom. Rays of heat from the wire are projected into the interior of the Specification of Letters Patent.

Patented May a, 1919. Serial No. 246,663.

insulator through the ports 6 and'reach the surface of the reflector and are projected forward, the consequence being that a fairly concentrated beam of heat is projected forward from the apparatus.

The circumferential ridges-between the grooves 4 serve in separating the windings of the coil resistance wire and preventing 1. An electric heater comprising, a concave reflector, a frusto-conical insulator fixed at the center of the insulator and presenting its smaller end forwardly and provided on its periphery with a helical groove with a low separating land, and a helical coil of resistance wire coiled in such groove, the helical coil having a diameter greater than that of the groove in which it is seated, combined substantiallv as set forth.

2. A combination such as defined in claim 1, in combination with a supporting stud projecting from the larger end of the insulator. substantially as set forth.

3. A combination such as defined in claim 1, when the insulator is hollow and its back open, substantially as set forth.

4. A combination such as defined in claim 3, when the insulator is provided with ports extending through its wall at the bottom of the groove, substantially as set forth.

5. A combination such as defined in claim 2 when the rear end of the stud is anchored in the center of the reflector, substantially as set forth.

6. A combination such as defined in claim 5 when the larger end of the insulator is spaced away from the reflector, substantially as set forth.

ALLEN Annnnws, Jr., M: S. BELDEN. 

